Sur Empire

The Sur Empire was an empire ruled by the Afghan-origin Sur dynasty in northern India for nearly 16 or 18 years, between 1538/1540 and 1556, with Sasaram (in modern-day Bihar) serving as its capital. It was founded by Sher Shah Suri.

The Sur dynasty held control of nearly all the Mughal Empire territories along the Indo-Gangetic Plain, from eastern Balochistan in the west of Indus River to modern-day Rakhine, Myanmar in the east. Even as Sher Shah Suri consolidated his power over North India, Eastern India was still considered to be the seat of Sur power in India. This is demonstrated by the fact that 8 of the 16 silver mint cities he established were in the region between Chunar and Fathabad.

Sher Shah Suri's relentless campaigns on the Bengal Sultanate prompted its ruler to request aid from Humayun, who in turn mobilized a Mughal army in July 1537, and advanced to Chunar. He reached the fort in November 1537 and laid siege to it. The siege of the fort at Chumar would last over six months until it finally fell despite the attempts from Rumi Khan to make quick work of the city. Sher Shah then led a second invasion into Bengal, and besieged Gauda. Gauda fell to the Afghan forces in April 1538. With the fort of Rohtasgarh also falling under his control in March 1538, which he used as a place to situate Afghan families and the loot he had obtained during the war, also transferring the loot he obtained from Gaur to Rohtasgarh. With this victory, Sher Shah held his first coronation. Following the fall of Gaur, Sher Shah offered favorable peace terms to Humayun, offering 10,000,000 dinars, and that he would surrender Bihar in exchange for control of Bengal. Humayun did not wish to leave Bengal in the hands of a hostile state, especially with its rich resources, as well as the contributing factor that Ghiyasuddin Mahmud Shah, wounded, entered the camp of Humayun and requested the continuation of war against Sher Shah. Ghiyasuddin would die from his wounds not long after.

Following this, Humayun began his march to Bengal against Sher Khan, however the march of the Mughal army would be overwhelmed from poor weather conditions, with rains causing the loss of his baggage between Patna and Monghyr. Humayun eventually reached Gauda and seized it without any opposition on 8 September 1538. However, the city was abandoned by the Afghans, with no loot as they had stripped the treasury. Humayun remained at Gaur for months, stuck there due to the weather, however he restored order into the city. However, as this was happening, Sher Khan drove deep into his territory, seizing Bihar and Varanasi, while also recovering control over Chunar, and laying siege to Jaunpur, with other detachments of the Afghan army extending as far as Kannauj. As a result, Humayun was effectively stranded at Gauda with no communication lines. After learning of disturbances at Agra, Humayun rushed to settle for peace with Sher Khan, which was concluded. Humayun crossed the Karmanasa River, where he could easily be attacked by the Afghans. Sher Khan, seeing the fragile state of the Mughal army, attacked the Mughal army led by Humayun at the Battle of Chausa. The Afghans descended on the Mughals and caught them off guard, and resulted in the complete rout of the Mughals. Humayun barely escaped with his life, and the Mughals suffered over 7,000 dead, with many prominent noblemen dead.

Following his defeat, Humayun returned to Agra, and restored order after disturbances from his brother, Hindal Mirza. Humayun mobilized a large force, and advanced with an army of 40,000, while Sher Shah amassed 15,000. Humayun met Sher Shah at Kannauj, with both armies mirroring each other across the Ganges river. Humayun crossed the river and began skirmishing with Sher Shah's army. Amidst the fighting, Humayun's army saw many nobles hiding their insignia to prevent them from being recognized by the Afghans, with many nobles also fleeing from the battle. The Mughal army was defeated, which led to Humayun fleeing to Sindh. Following this victory, Sher Khan was crowned a second time on 17 May 1540 as Sher Shah, being declared as Emperor of Northern India, while also donning the epithet of Sultan Adil, meaning "Just King".

With the defeat and flight of Humayun, Sher Shah captured Delhi.

Realizing the importance of Bengal, Sher Shah focused much of his administrative efforts in the region. Khijir Khan, the governor of Bengal under Sher Shah, led a revolt in March 1541. Sher Shah mobilized an army and lead it himself, defeating Khijir Khan and restoring Bengal under his suzerainty. Bengal was divided into 47 smaller administrative divisions, appointing them under a shiqdar, which would be oversighted by Kazi Fajilot as the chief supervisor of the Muqtars. These reforms saw the prominence of Afghans in Bengal, with many Afghans moving and settling in the region. Some of the Afghans who settled in the region would go on to establish the Muhammad Shahi dynasty, which ruled Bengal from 1553 to 1563, and the Karrani dynasty, which ruled from 1563 to 1576.

Following the flight of Humayun, Sher Shah continued in pursuit, advancing into the Punjab. Sher Shah advanced on Lahore, and caused panic among the Mughals. Kamran Mirza was not prepared to face Sher Shah, and as a result, retreated to Kabul, leaving the region to Sher Shah. Sher Shah captured Lahore in November 1540, with Afghan armies advancing as far as the Khyber Pass, but not extending his empire beyond the Indus as Sher Shah did not wish to incorporate many Afghans who enjoyed their independence and face difficulties with them. The Afghans also seized control of Multan in 1541, but did not pursue the retreat of the Mughals further, seeing them as no longer as a threat.